Tyson, "all of the above" but one more likely reason, this though assuming you have the fluke tied on and hooked up properly:

It may be the way you are reeling in fish.

With a spinning reel, you cannot reel against the drag. A bait caster spools up the line unless its drag is exceeded. But, even then, no twisting occurs.

But, with a spinning reel, if you reel against the drag (line going out as you reel), the arbor still turns and each turn puts a twist in the line though no line is taken up or is actively coming off the spool.

So, technique wise, a bait casting reel can be muscled, if the angler wants to ski a fish in, for example. On spinning tackle, you fight the fish with the rod, not the reel, by pulling up or to the side, then reeling down on the line to secure whatever advantage you just made. Then you battle the fish with the rod again, then you reel down on the slack you created. Again and again.

I'd say this actually causes more line twist than any other aspect. We get excited when a fish is on, forget and reel against the drag.

Brad